Method for recovering nickel and cobalt in waste cobalt-based high-temperature alloy through melt extraction separation

A high-temperature alloy, separation and recovery technology, applied in the direction of reducing gas emissions and improving process efficiency, to achieve the effects of wide application, low energy consumption and investment saving

Active Publication Date: 2020-10-16
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current recovery method can only convert the cobalt in the superalloy waste into cobalt salt or cobalt powder, and there is no report to directly convert the cobalt in the superalloy return material into high-purity cobalt

Method used

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  • Method for recovering nickel and cobalt in waste cobalt-based high-temperature alloy through melt extraction separation

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Effect test

Embodiment 1

[0043] The cobalt-based superalloy waste to be recovered and separated in this embodiment includes Co, Ni, Fe, Cr, Mo, Ta elements, wherein the mass percentage of Co is 59.3%, and the mass percentage of Ni is 11.5%.

[0044] combine figure 1 , The method for separating and recovering nickel and cobalt from cobalt-based superalloy waste in this embodiment includes the following steps.

[0045] (1) Treating the surface of the cobalt-based superalloy waste to remove the refractory material on the surface of the cobalt-based superalloy waste, and then cleaning and drying the waste cobalt-based superalloy to obtain clean raw materials.

[0046] (2) Take 800g of clean cobalt-based superalloy material, 2400.0g of Zn-Pb binary alloy as the extraction medium, and the molar percentages of Zn and Pb in the Zn-Pb binary alloy are 70% and 30% respectively. Put the clean cobalt-based superalloy in a porous and liftable titanium mesh, place the extraction medium in a quartz crucible, then p...

Embodiment 2

[0049] The cobalt-based superalloy waste to be recovered and separated in this embodiment includes Co, Ni, Fe, Mo, Ta elements, wherein the mass percentage of Co is 56.4%, the mass percentage of Ni is 11.5%, and the mass percentage of Fe is Min content is 8.3%.

[0050] combine figure 1 , The method for separating and recovering nickel and cobalt from cobalt-based superalloy waste in this embodiment includes the following steps.

[0051] (1) Treating the surface of the cobalt-based superalloy waste to remove the refractory material on the surface of the cobalt-based superalloy waste, and then cleaning and drying the waste cobalt-based superalloy to obtain clean raw materials.

[0052] (2) Take 1000g of clean cobalt-based superalloy material, 5000.0g of Zn-Sn binary alloy as the extraction medium, and the molar percentages of Zn and Sn in the Zn-Sn binary alloy are 60% and 40% respectively. The clean cobalt-based superalloy is placed in a porous and liftable titanium mesh, th...

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Abstract

The invention discloses a method for recovering nickel and cobalt in a waste cobalt-based high-temperature alloy through melt extraction separation. The method comprises the following steps: 1, extraction treatment is carried out with a molten Zn-M alloy as an extraction medium, and a waste and old cobalt-based high-temperature alloy as an extract to obtain eutectoid and alloy residues, wherein inthe Zn-M alloy, Zn is a main metal and M is one or more of Pb, Bi or Sn; and 2, vacuum distillation is carried out on the eutectoid obtained in step 1 to obtain metal nickel cobalt powder and a condensed extraction medium. According to the method for recovering nickel and cobalt in the waste cobalt-based high-temperature alloy through melt extraction separation, the process is clean and efficient. The method has the advantages of short process flow, simple equipment, high nickel-cobalt recovery rate, low cost, recyclable extraction medium, and clean and environment-friendly process.

Description

technical field [0001] The invention relates to the technical field of recycling waste superalloys, in particular to a method for recycling metal nickel and cobalt in waste cobalt-based superalloys. Background technique [0002] Cobalt-based superalloys refer to cobalt-based superalloys that have high strength, good thermal corrosion resistance and oxidation resistance in the temperature range of 730 ° C to 1100 ° C. Cobalt-based superalloy scrap contains not only main metal elements such as cobalt and nickel, but also a large number of precious rare metal elements, such as rhenium, tungsten, tantalum, niobium and hafnium, etc., which have important recycling value. Nearly 300,000 tons of superalloy materials are consumed in the international market every year. Therefore, the recycling of superalloys has a good prospect. Superalloys that have reached their service life and waste generated during the production process are important sources of superalloy recycling. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/02
CPCC22B7/001C22B23/02Y02P10/20Y02P10/146
Inventor 田庆华甘向栋郭学益崔富晖于大伟张纯熹
Owner CENT SOUTH UNIV
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